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Search Results: 1 - 10 of 209887 matches for " López-Espinoza "
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?SON LAS DIETAS UNA “CAUSA” DEL SOBREPESO? UN ANáLISIS CONTRAFáCTICO1
LóPEZ-ESPINOZA,ANTONIO;
Universitas Psychologica , 2005,
Abstract: the objective of the current work is to ask for the role of diets in the body weight. the experimental evidence showed that when deprivation was removed body weight was recovered or even increased. in the analysis of this phenomenon, the principal philosophical approach of causality concept and the counterfactual model proposed for von wright was used. the results demonstrated that a deprivation period is a sufficient condition to produce gain weight when returning to free access.
CAN DIETS “CAUSE” OVERWEIGHT? A COUNTERFACTUAL ANALYSIS
ANTONIO LóPEZ-ESPINOZA
Universitas Psychologica , 2005,
Abstract: The objective of the current work is to ask for the role of diets in the body weight. The experimental evidence showedthat when deprivation was removed body weight was recovered or even increased. In the analysis of this phenomenon,the principal philosophical approach of causality concept and the counterfactual model proposed for Von Wright wasused. The results demonstrated that a deprivation period is a sufficient condition to produce gain weight whenreturning to free access.
Reference Fields Analysis of a Markov Random Field Model to Improve Image Segmentation
López-Espinoza, E. D.;Altamirano-Robles, L.;
Journal of applied research and technology , 2010,
Abstract: in markov random field (mrf) models, parameters such as internal and external reference fields are used. in this paper, the influence of these parameters in the segmentation quality is analyzed, and it is shown that, for image segmentation, a mrf model with a priori energy function defined by means of non-homogeneous internal and external field has better segmentation quality than a mrf model defined only by a homogeneous internal reference field. an analysis of the mrf models in terms of segmentation quality, computational time and tests of statistical significance is done. significance tests showed that the segmentations obtained with mrf model defined by means of non-homogeneous reference fields are significant at levels of 85% and 75%.
Reference Fields Analysis of a Markov Random Field Model to Improve Image Segmentation
E. D. López-Espinoza,L. Altamirano-Robles
Journal of applied research and technology , 2010,
Abstract: In Markov random field (MRF) models, parameters such as internal and external reference fields are used. In thispaper, the influence of these parameters in the segmentation quality is analyzed, and it is shown that, for imagesegmentation, a MRF model with a priori energy function defined by means of non-homogeneous internal andexternal field has better segmentation quality than a MRF model defined only by a homogeneous internal referencefield. An analysis of the MRF models in terms of segmentation quality, computational time and tests of statisticalsignificance is done. Significance tests showed that the segmentations obtained with MRF model defined by means ofnon-homogeneous reference fields are significant at levels of 85% and 75%.
Conditioned Taste Aversion Diminishes Sugar Intake  [PDF]
Alma Gabriela Martínez Moreno, Antonio López-Espinoza, Imelda de León López, Laura Vanesa Solano Santos, Fernando Hernández- Leonardo
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.511110
Abstract:

Animals learn to avoid particular food when some of its sensory properties are associated with gastrointestinal discomfort. Twenty rats were exposed to free access to food and a sugar solution for ten days in first phase. During second phase, experimental group received a dose of LiCl. Control group received an injection without LiCl. Both groups had free access to a sugar solution and food restriction for three days. In the final phase, both groups returned to the conditions of first phase. Results showed a significant decrease in sugar intake after aversive conditioning regarding the intake registered in the initial phase in experimental group. Control group did not show any differences in its sugar intake before and after the experimental manipulation. The procedure carried out is discussed as a means to decrease sugar intake.

EFECTOS DE MODIFICAR EL CONTENIDO ENERGéTICO DEL AGUA SOBRE EL PESO CORPORAL, CONSUMO DE AGUA, ALIMENTO Y CALORíAS EN RATAS
MARTíNEZ,ALMA GABRIELA; LóPEZ-ESPINOZA,ANTONIO; MARTíNEZ,HéCTOR;
Universitas Psychologica , 2006,
Abstract: six albino rats were divided in two experimental groups and one control. the experiment began with fifteen days of free access; subsequently experimental groups maintained available three concentrations of glucose: high, middle and low. first group received high-middle-low-high-middle-low sequence and second group received low-middle-high-low-middle-high sequence during six days. control group not received glucose concentrations. caloric concentration of food never changed. results suggest that modification of caloric concentration in water affects feeding behavior. nevertheless, water with glucose consumption did not change body weight.
Efectos de la modificación del contexto en el consumo de agua y alimento durante un estado de saciedad en ratas
Ordaz,Nayely; López-Espinoza,Antonio; Martínez,Héctor;
Universitas Psychologica , 2005,
Abstract: six rats were exposed to three alimentary contexts, the first one, considered as habitual context, provided food only for a period of time. the second contained in the surface a cover of stones and allowed free access to the food until the subject achieved the satiety state. the third context (novel) contained water in the surface and provided food during the test phase. the food consumption was compared between the habitual context and the novel one after the subject achieved the satiety state. the results show that in spite of the satiety the subjects consumed food in the novel context, but they didn’t consume food in the habitual context. these results are discussed in terms of how the context influences the feeding behavior.
Efecto del tipo y controlabilidad del estrés sobre la conducta alimentaria en ratas
González-Torres, Marina Liliana;López-Espinoza, Antonio;Valerio Dos Santos, Cristiano;
Revista mexicana de análisis de la conducta , 2010,
Abstract: the objective of this study was to evaluate the effects of two types of stress, chronic or acute, in either controlled or uncontrolled situations, on body weight, food, and water consumption in rats. acute stress consisted of two sessions of 60 electric shocks and chronic in 12 sessions of 10 shocks. subjects exposed to the controllable situation could finished the shock with a specific response, and the group uncontrollable was yoked to the uncontrollable group. control group was kept in its box-room. the results were: reduction of the body weight during exposure to acute stress and a slowdown in the rate of body weight increase during chronic stress, as well as a reduction in the consumption of both food and water during exposure to both acute and chronic stress. the effects observed with chronic stress were more evident robust in males than in females. there were no differences between groups exposed to controllable and uncontrollable stress. these results are discussed in relation to the hypothesis of regulatory change and behavioral ecology.
EFFECTS TO MODIFY THE CONTEXT ON THE CONSUMPTION OF WATER AND FOOD DURING A STATE OF SATIETY IN RATS
NAYELY ORDAZ,ANTONIO LóPEZ-ESPINOZA,HéCTOR MARTíNEZ
Universitas Psychologica , 2005,
Abstract: Six rats were exposed to three alimentary contexts, the first one, considered as habitual context, provided food only fora period of time. The second contained in the surface a cover of stones and allowed free access to the food until thesubject achieved the satiety state. The third context (novel) contained water in the surface and provided food during thetest phase. The food consumption was compared between the habitual context and the novel one after the subjectachieved the satiety state. The results show that in spite of the satiety the subjects consumed food in the novel context,but they didn’t consume food in the habitual context. These results are discussed in terms of how the contextinfluences the feeding behavior.
EFFECTS TO MODIFY THE CALORIC CONTENT OF WATER ON BODY WEIGHT, WATER, FOOD AND CALORIES CONSUMPTION IN RATS
ALMA GABRIELA MARTíNEZ,ANTONIO LóPEZ-ESPINOZA,HéCTOR MARTíNEZ
Universitas Psychologica , 2006,
Abstract: Six albino rats were divided in two experimental groups and one control. The experiment began withfifteen days of free access; subsequently experimental groups maintained available three concentrationsof glucose: high, middle and low. First group received high-middle-low-high-middle-low sequence andsecond group received low-middle-high-low-middle-high sequence during six days. Control group notreceived glucose concentrations. Caloric concentration of food never changed. Results suggest thatmodification of caloric concentration in water affects feeding behavior. Nevertheless, water with glucoseconsumption did not change body weight.
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